Synopsis
The XSPEC plcabs model: powerlaw observed through dense, cold matter.
Syntax
xsplcabs The xsplcabs model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsplcabs", "mdl")
>>> print(mdl)Create a component of the xsplcabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.nH thawed 1 0 1e+06 10^22 atoms / cm^2 mdl.nmax frozen 1 -3.40282e+38 3.40282e+38 mdl.FeAbun frozen 1 0 10 mdl.FeKedge frozen 7.11 7 10 KeV mdl.PhoIndex thawed 2 -3 10 mdl.HighECut frozen 95 0.01 200 keV mdl.foldE frozen 100 1 1e+06 mdl.acrit frozen 1 0 1 mdl.FAST frozen 0 -3.40282e+38 3.40282e+38 mdl.Redshift frozen 0 -0.999 10 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| nH | The column density, in units of 10^22 cm^-2. |
| nmax | The maximum number of scatterings. This parameter can not be thawed. |
| FeAbun | The iron abundance. |
| FeKedge | The energy of the Fe K edge, in keV. |
| PhoIndex | The power law photon index. |
| HighECut | The high-energy cut-off threshold energy, in keV. |
| foldE | The high-energy cut-off e-folding energy, in keV. |
| acrit | The critical albedo for switching to elastic scattering. See [1] for more details. |
| FAST | If set to a value above 1, use a mean energy shift instead of integration. This parameter can not be thawed. |
| redshift | The redshift of the source. |
| norm | The normalization of the model. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelPlcabs.html
XSPEC version
CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.14.0k
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.